RE: Epoxy mixture?
Matt,
I'm pretty sure Randy is talking about joining the upper and lower skins of a hollow molded wing. The skin sandwich panels (balsa or foam sheet core) are bagged into their respective molds. The spars, ribs, etc. are then installed and bonded to one of the wing skins (usually with microballoons/epoxy) as a secondary operation. After a final fit-check, the entire assy is bonded together with a bead of adhesive along the perimeter, along the spars and on the ribs... again, typically with micro/epoxy. The molds have guide pins for alignment of the upper and lower skins.
It sounds like he's asking you to suggest a potential alternate adhesive.
-David